64331945 has 4 divisors (see below), whose sum is σ = 77198340. Its totient is φ = 51465552.

The previous prime is 64331941. The next prime is 64331957. The reversal of 64331945 is 54913346.

It is a happy number.

64331945 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 44368921 + 19963024 = 6661^2 + 4468^2 .

It is a cyclic number.

It is not a de Polignac number, because 64331945 - 2² = 64331941 is a prime.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (64331941) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 6433190 + ... + 6433199.

It is an arithmetic number, because the mean of its divisors is an integer number (19299585).

Almost surely, 2^64331945 is an apocalyptic number.

It is an amenable number.

64331945 is a deficient number, since it is larger than the sum of its proper divisors (12866395).

64331945 is a wasteful number, since it uses less digits than its factorization.

64331945 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 12866394.

The product of its digits is 38880, while the sum is 35.

The square root of 64331945 is about 8020.7197307972. The cubic root of 64331945 is about 400.6903599059.

The spelling of 64331945 in words is "sixty-four million, three hundred thirty-one thousand, nine hundred forty-five".